I think that my life is over.

You can have a degree in theoretical physics, bio-semiotics, mathematics, what have you, but the reality they don't tell you about before you're far too invested in the university system to turn back, is that the more specialized the knowledge, the more redundant it will be in the 'real world' outside the university.

So if you think you have it in you, go the post-grad route and try to get hired doing research and/or teaching within the university system. You might have had a slow start compared with those people we all know who seem to have been groomed in a controlled atmosphere conducive to optimal functionality - I felt very much the same at university - but it helps to try to stress a little less over what future employers might think of your resume, what blemishes on your history life's gatekeepers might find.

Look at it this way: the vast majority of people are not very intelligent - to put it nicely. For better or worse, the system has been designed accordingly, so as to accommodate for users' intellectual deficiencies. There's nothing stopping a raving idiot from having a high paying job.

It's one thing to know where you want to go, but then another to live under a constant fear of what 'they' will think of how you've done so far in life.